It never fails. At the last two or three characters of a password, I’ll strike two keys at the same time. Maybe I pressed both, maybe I only pressed one. Whatever happened, certainly it doesn’t make any sense to press return and roll the dice. I’ll either get in or fail and have to type it all over again, and sysadmins can’t admit failure nor can we entertain the possibility of failing!!
So what’s the most logical maneuver? Backspace 400 times to make sure you got it all and try over. Make sure you fumble the password a few more time in a row so you can get a nice smooth spot worn on your backspace key.